Sprinkler base



FIG. 1 is a perspective view of a sprinkler base showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines shown in FIGS. 1–7 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for the “sprinkler base,” as shown and described. 